Trim saw assembly



Y y Filed Aug. 24, 1943' Sept. 16, 1947.

IanLEY man Harr'yavmaun f miv 7 26 2%3-22 w nl!! a 45 '7 fl!! 7* 44 @Jy@ g i@ Fi@ f4 i I 36 4Z 5 i mii '57 'QM gaen 15 Patented Sept. 16, 1947ED STATES PATENT OFFICE TRIM SAW ASSEMBLY Application August 24, 1943,Serial No. 499,846 In Canada June 28, 1943 (Cl. lll-242.16)

3 Claims. l

This invention relates to improvements in trim saw assemblies.

An object of the present invention is the provision of aY trim sawassembly-in which the ho-using which carries the saw floats on the samebearing that drives the latter.

Another object is the provision of a trim saw assembly includingextremely simple and eiective means for tightening the drivingconnection between the power shaft and the arbor on which the saw ismounted.

A further object is the provision of a trim saw assembly requiringlittle space, whereby saws in a battery may be placed close together.

With these and other objects in view, the present invention consistsessentially of a trim saw assembly comprising a power shaft, a housingpivotally mounted on the shaft, an arbor rotatably mounted in thehousing spaced from the shaft, one end of said arbor projecting beyondthe housing, means for forming a driving connection in the housingbetween the shaft and the arbour, means associated with the power shaftfor adjusting the distance between said shaft and the arbour, and a trimsaw mounted on the arbour outside the housing, as more fully describedand illustrated by way of example in the following specification and theaccompanying drawings, in which Figure 1 is a side elevation, partly insection, of a trim saw assembly, and

Figure 2 is a vertical section taken substantially at right angles toFigure 1.

Referring more particularly to the drawings, I0 is a power shaft whichis supported and rotated in the usual manner (not shown) and one or moreframes or housings I I `are pivotally mounted on said shaft, one only ofsaid frames or housings being illustrated in the drawings. This housingis preferably elongated and mounted adjacent one end on the power shaft,and it has an arbor I2 rotatably mounted therein adjacent its oppositeend. The end I3 of said arbor projects beyond the housing, and its outerend is threaded, as shown. Any desirable means is provided for formingla driving connection in the housing between the power shaft and thearbor, and if desired, any suitable means may be provided for adjustingthe distance between said power shaft and arbor. The preferred, but notthe only, method of achieving these results will now be described.

A sprocket-wheel I6 is xedly mounted on the shaft Iii in the housing inany suitable manner, such as, by means of a key l'I fitting cartridges22.

into corresponding keyways in the wheeliand the shaft. Thissprocket-wheel has an extended hub I8 projecting outwardly from each endthereof. The housing II on the extended hubs and it isV preferable tofit anti-friction bearing therebetween, such as ball bearings 2@ inretainers 2|. The housing may be carried directly bythe bearings or, asshown, eccentric cartridges 22l may be interposed between the bearingsand the housing at' each side thereof. Each cartridge consists ofarcylinderV 23v with a circular bore 2li extending therethrougheccentrically in relation to its periphery, and a ange 25 on its outerend. The bores 2i fit over the retainers 2I of the bearings. Thecartridges are rotatable relative to the housing and the extended hubsor the power shaft to shift the housing in relation to the latter. Thebearings are retained in place in any suitable manner, such as by endcaps 26 fitting over the power shaft or, as illustrated, over theextended hubs to cover the bearings and cartridges. Each cap has acentral opening 27 through Which the shaft or the hubs extend, and oilseals 28 may be provided in these openings between the caps and the hubsor shaft.

Another sprocket-wheel 3l is flxedly mounted on the arbor I2 in thehousing. One or more chains 32 form a driving connection between thesprocket-wheels IS and 3|. If desired, bearings 33 in retainers 3d maybe placed between the arbor and the housing in openings 35 provided inthe latter for this purpose, and end caps 36 and 36a cover the openingsand the bearings. One of these caps as 36a has a central opening 31therein through which the end I3 of the arbor projects. An oil seal 38is provided in this opening between the arbor and the cap. A fixedcollar 39 xedly mounted `on the end I3, bears against a shoulder Ilformed on the arbor, and a trim saw @I against which a loose collar 42bears, is rmly pressed against the fixed collar by a nut d3 which isthreaded on to the outer end of the arbor.

Inspection openings 44 having covers 45 removably mounted thereon may beprovided in the housing II between the shaft I0 and the arbor E2.Furthermore, an opening 46 having a cover il removably mounted thereonmay be formed in the outer or free end of the housing.

In use, the rotation of the power shaft II] is transferred to the arborI2 through the chains 32, thus rotating the trim saw III. The chains maybe loosened or tightened by turning the This causes the housing I I and,

actually is mounted consequently, the arbor to move longitudinally inrelation to the power shaft so that the sprocketwheels I6 and 3| aremoved towards or away from each other. At the same time, the housing maybe moved about the axis of the power shaft owing to the fact that it isor the cartridges are actually mounted on bearings which are concentricwith the shaft.

The housing of this trim saw assembly floats on the bearing that drivesthe saw so that the bearing serves a double purpose. Furthermore, thedriving connection between the power shaft and the saw may be quicklyand readily adjusted without the necessity of removing any parts.

Various modifications may be made in this invention without departingfrom the spirit thereof or the scope of the claims and, therefore, theexact forms shown are to be taken as illustrative only and not in alimiting sense, and it is desired that only such limitations shall beplaced thereon as are disclosed in the prior art or are set forth in theaccompanying claims.

What we claim as our invention is:

1. A trim saw assembly comprising a housing, a-sprocket wheel in thehousing adapted to be xedly mounted on a drive shaft, an extended hub onsaid wheel projecting outwardly from each side of the wheel,anti-friction bearings mounted on each hub, cartridges extending aroundeach bearing and a cap extending over a bearing and cartridge alsomounted on each hub, said housing having aligned apertures formed in oneend, each adapted to engage a cartridge, whereby the housing ispivotally mounted with respect to the drive shaft.

2:A trim saw assembly as claimed in claim 1 in which each cartridge isformed having an outer cylindrical surface eccentric to a surface incontact with the anti-friction bearings, whereby rotatory adjustment ofthe cartridges adjusts the distance between the axis of the drive shaftand the housing.

3. A trim saw assembly as claimed in claim 1 in which the hubs extendlaterally on each side of the sprocket wheel, each hub being formed withtwo stepped cylindrical surfaces, a corresponding anti-friction bearingbeing mounted on the inner stepped surface of each hub, and each capbeing mounted on the outer stepped surface of each hub.

STANLEY MORTON. HARRY DRANEY DAVIDSON.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 449,957 Simonds Apr. 7, 18911,747,430 Dorman Feb. 18, 1930 1,783,362 Goodspeed Dec. 2, 1930 844,892Pfander Feb. 19, 1907 FOREIGN PATENTS Number Country Date 473,771 FranceOct. 12, 1914

